Rapid quantification of radiocesium dissolved in water by using nonwoven fabric cartridge filters impregnated with potassium zinc ferrocyanide

Abstract

This paper presents a cartridge filter incorporating a nonwoven fabric impregnated with potassium zinc ferrocyanide (Zn-C) to effectively concentrate and quantify cesium dissolved in water. Experiments conducted with 137 Cs in conditioned water showed that at a flow rate of 2.5 L/min the filter could absorb 97.9% of dissolved 137 Cs from 20 L of water; high recovery efficiency was achieved over a pH range of 3-10. Test measurements of 137 Cs concentrations using Zn-C in river water agreed with the results derived by using an evaporative concentration method (within the counting error of the detector). Using this method, the pre-concentration time of radiocesium in 20 L of fresh water can be reduced to just 8 minutes.

Behavior of dissolved radiocesium in river water in a forested watershed in Fukushima Prefecture

“…Particulate and dissolved radiocesium of sampled river water and groundwater was collected separately using two types of cartridge filter [ Tsuji et al ., ; Yasutaka et al ., ] immediately after sampling to minimize the influence of 137 Cs redistribution between the liquid and solid phases. We first collected suspended solids with a 1 µm pore size using a nonwoven fabric cartridge filter (RP13‐011; Japan Vilene Co. Ltd., Tokyo, Japan) [ Tsuji et al ., ], after which we collected dissolved radiocesium using a nonwoven fabric cartridge filter impregnated with potassium zinc ferrocyanide (CS‐13ZN; Japan Vilene Co. Ltd., Tokyo, Japan) [ Yasutaka et al ., ]. The collecting method for dissolved radiocesium using a nonwoven fabric impregnated with Prussian blue was developed in Japan after the FDNPP accident [ Yasutaka et al ., ].…”

“…[] and Yasutaka et al . []. Throughfall water, rainfall water, and soil water were poured into 1 L or 2 L Marinelli containers before serving to the detector.…”

Unveiling Cs-adsorption mechanism of Prussian blue analogs: Cs+-percolation via vacancies to complete dehydrated state

“…For a more severe test of stability in aqueous water, we used the same system as used for the desalination of the KCuHCF-NP slurry, as shown in Fig. 2 6 ] solution with 100 mmol L À1 CuSO 4 solution to obtain Cu/Fe ¼ 0.65. For the test, the prepared KCuHCF was estimated to be 6.7 g, and 38 L of Milli-Q water was used for rinsing.…”

“…For the separation and decontamination of radioactive caesium, the use of adsorbent is efficient and cost effective. Among various adsorbents, metal hexacyanoferrate (MHCF), [3][4][5][6][7][8][9][10][11][12] zeolite, [13][14][15] calix arenes, [16][17][18] ion exchange resins, 19 metal organic frameworks, 20 ionic crystal, 21 and silicotitanate 22,23 have been surveyed and used as Cs-adsorbents. Metal hexacyanoferrates are known for high selectivity, capacity, and applicability for trace concentrations of cesium.…”

“…For example, Cu[Fe(CN) 6 ] 0.5 showed Cu + elution aer long adsorption, implying exchange between Cs + and Cu 2+ . 36 On the other hand, K 2 CuFe(CN) 6 adsorbed Cs + with degradation of the crystal structure. 37 Thus, unclear issues for the adsorption mechanism of MHCF remain.…”